Strabismus is a vision problem in which both eyes do not look
at the same point at the same time. It usually develops during childhood and is
sometimes called "crossed-eyes," "walleye," or "squint."
Normally, the muscles attached to each eye work together to move both eyes in
the same direction at the same time. Strabismus occurs when the eye muscles do
not work properly to control eye movement. Often the cause is not known. Causes
may include farsightedness, head injury, and muscle and nerve disorders that
weaken or damage the muscles that control eye movement.
treatment, strabismus can cause permanent vision problems. Not using one eye
can also lead to poor vision in that eye (called lazy eye or amblyopia).